class_docstr: ChunkStore maps chunk id to tokens. It is used as an in memory storage for dynamic retrieval DB.
code: def reset(self):
      self._count = 0
      self.store = {}
      self.store[-1] = self.no_retrieval
  
imports: import base64
  import logging
  import pickle
  import threading
  import time
  from collections import namedtuple
  from typing import List
  import faiss
  import numpy
  import torch
  from flask import Flask, jsonify, request
  from flask_restful import Api
  from nemo.collections.common.tokenizers.tokenizer_spec import TokenizerSpec
  from nemo.collections.nlp.modules.common.megatron.retrieval_services.static_retrieval_server import FaissRetrievalResource
  from nemo.collections.nlp.modules.common.megatron.retrieval_services.util import lock, request_data
label_desc: Use image node_id 4 for calling the ChunkStore obj's underlying member method code with example usage: obj.reset() without return types